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J. EGGERS AND P. THOMSEN. COMB'INED MARINE WATER TUBE BOILER AND SUPERHEATER.

APPLICATION FILED FEB. 21. I916.

Patented Sept. 23, 1919.

' WITNESSES fiw awmm INVENTORS JUL /U.$ [ESE/P5 F5727? THOMSE/V A TTOR/I/EYS JULIUS EGGERS, F CASSEL-WILHELMSHfiHE, AND FEEDER THCMSEN, 0F GASSEL GERMANY, ASSIGNORS, BY MESNE ASSIGNMENTS, T0 LOGOMOTIVE SUPER- HEATER COMP-QTY, A. CORPORATION OF DELAWARE.

COMBINED MARINE WATER-TUBE BOILER AND SUPERHEATELR.

Specification of Letters Patent.

Patented Sept. 23, 1919..

Application filed February 21, 1916.: Serial No. 79,632.

To all whom it may concern Be 1t known that we, JULIUS Eeenns and PnrnnTHoMsnN, both citizens of the German Empire, residing, respectively, at Cassel-wilhelmshohe, and at Oassel, Germany, have invented a new and, useful Combined Marlne Water-Tube Boiler and Superheater,

- of which the following is a specification.

In marine water tube boilers especially such with flue tubes of restricted cross section, one upper drum and. two or three lower drums, and with a superheater arranged in the last lateral flue at the side of the water tubes, there is a particularly great necessity to dispose within the comparatively small flue space a large-superheating surface in such a manner that no wateror air pockets can arlse during the more or less long service nterruptlons, for instance, in a harbor. Besides this condition, certain others require fulfilling,.viz., maintaining the counher current, as well as the possibility of fastening the superheater pipes without special supports, and to. shape and arrange them in such a way that they maybe conveniently connected attheir upper ends with the upper drum or the wet steam distributer and at their lower ends with the superheated steam collector.

Amon the various forms of construction of en er eaters as employed in connection with oilers of the kind in question there are also such consisting of a plurality of flat coils which are connected in parallel and are so arranged that the coils are located in vertical planes standing'crosswise to the longitudinal axis of the boiler. Such superheater pipes are made use of also in the present case, but the shape of these pipes is such that the formation of airand water-pockets is prevented even if the vessel isinclmed in a certain degree to one or the other side, that shape being moreover such that a great superheating surface can be disposed in the respective flue. Each of these superheating pipes is zig-zag-shaped,

' but the two pipe sectionsbelongin to, and

- alternate with each other; the shorter legs I forming, any one of the acute ang es of an individual superheater pipe are 0 difierent length; the shorter legs and the longer ones are inclined downwardly in the direction of the adjacent set of the water tubes of the boiler, and the longer onesare inclined 1n the direction to the outer shell of the boiler, as is all more fully described hereinafter and shown, in two forms of construction, in the accompanying drawing in-which:

Figure l is a diagrammatical representathe superheater consists of two sets of indi-.

vidual superheater pipes or elements which alternate with each other lengthwise of the boiler in such a manner that each short leg of any one of the zig-zag-shaped flat coils crosses the neighboring two long legs of the neighboring two flat coils, and the same 1 s true of the long legs of the first-named c011 and the short ones of the neighboring two.

Apart from the difierences between Figs. 1 and 2 that Fig. 1 has three lower drums, Fig. 2, however, but two, there are the further two difl'erences between said figures that,

first, in Fig. 1 the flat coils are each single, whereas in Fig. 2 double coils are employed, a. 3. each individual su erheater element 15 made up of two pipe engths la1d side by side in a plane transverse to the boiler axis and bent as one in zigzag fashion with alternating short and long legs as described for thesingle pipes of'Fig. 1; second in Fig. 1 the whole of each coil has an oblique position, whereas in Fig. 2 only the lower part is so disposed.

Referrin from whichextend the zigza shaped flat coils a a consisting each of s ort portions or legs a, and of long ortions or legs a which alternate with eac other. The legs =11 are inclined downwardly in the direction of the ad'aoent boiler tubes; the legs a are inclined ownwardly to the other slde, and the flat coil as a whole is inchned parallel to Fig. 1, b is the upper drum,-

to said boiler tubes, as shown. The upper ends of the thus shaped and located flat.

coils, or superheating tubes'respectively, are

owing flue, because connected with the drum 6, receiving from this latter the saturated steam, the lower ends are connected with a superheated steam collector c from which the superheated steam is led to the engine. (1 is the inclosing shell of the boiler. It is obvious that neither the condensed steam arising at times within the superheating pipes, nor the air separating from the steam can form a pocket or pocking nevertheless the whole surface of each of.

them.

Referring to Fig. 2, each vertical superheating pipe plane contains two-such pipes which run parallel to one another throughout their whole length. The axis of each flat double coil, in its upper part, does not extend obliquely but vertically, and the upper ends of the pipes are not connected immediately with the drum 6, but with a saturated steam distributor 7 which is, in its turn, connected with said drum by means of a pipe g. The lower pipe ends are connected with a superheated steam collector 0, just as in Fig. 1.

element, said elements aerator Having now described our invention what we desire to secure by a patent of the United. States is:

The combination, with a water tubeboiler having laterally disposed upper and lower drums connected by water tubes, and a flue adjacent to and outside of said tubes, of a plurality of zig-zag shaped superheater elements in said flue each element comprising a plurality of shorter sections inclined downwardly in the direction of the neighboring watertubes, and a plurality of longer sec tions alternating with said shorter ones and inclined downwardly away from said water tubes; each element being bent in a plane transverse to the boiler axis and the axis of each element being substantially parallel to the direction of the water tubes; neighborin elements, furthermore, being mutually shifted axially with respect to one another so as to make the shorter sections of any element cross the longer sections of its neighboring element in the axial plane of the being in contact at such crossing, substantially as described and shown.

In testimony set our hands in the presence of two subscribing witnesses.

JULIUS EGGERS. PETER THOMSEN.

Witnesses: I BEEENE, W. W. LINDSAY.

whereof, we have hereunto 

